Wash the potatoes and cook for about 20 minutes. Quench cold and let it cool down a little. Peel and cut into slices. Cut bacon into cubes and let it crisp in a pan without fat. Heat clarified butter in it.
Add potato slices and fry until crispy brown while turning. Peel and chop the onions. Add to the potatoes and cook briefly. Season potatoes with salt and pepper